# US 2020/0396802 A1 · Surface type heating element having controlled oxide layer and manufacturing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0396802 A1 - Document ID: US20200396802A1 - Status: Published application - Kind: A1 - Application number: 16/898,987 - Filed: 2020-06-11 - Published: 2020-12-17 - Earliest claimed: 2019-06-12 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Yooseok KWON - Web page: https://patentgrep.com/patent/US20200396802A1 ## CPC - H05B 3/74: Non-metallic plates {, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits} - H05B 3/0071: {for domestic applications} - H05B 3/12: characterised by the composition or nature of the conductive material - H05B 3/141: {Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds} - H05B 3/18: the conductor being embedded in an insulating material - H05B 3/26: heating conductor mounted on insulating base {(for transparent areas H05B3/84, H05B3/86)} - H05B 3/283: {the insulating material being an inorganic material, e.g. ceramic} - H01C 17/06526: {composed of metals} - H05B 2203/002: Heaters using a particular layout for the resistive material or resistive elements - H05B 2203/013: Heaters using resistive films or coatings - H05B 2203/017: Manufacturing methods or apparatus for heaters - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - H01C: RESISTORS ## Abstract Discussed are a surface type heating element which generates heat using electricity and a method of manufacturing the surface type heating element. The surface type heating element includes a NiCr alloy and has an oxygen content of 1 to 4 wt %, so that it can be used even at a high operating temperature of 400° C. or more, suppresses the elution of the material itself, has high fracture toughness, a low coefficient of thermal expansion, and heat resistance, and furthermore, ensures conductivity by having improved adhesive strength with respect to at least one of a substrate and an insulating layer, and controlled electrical resistivity. ## Claims ### Claim 1 A surface type heating element to generate heat using electricity, the surface type heating element comprising: a NiCr alloy; and oxygen in an amount of about 1 to about 3 wt % of the surface type heating element. ### Claim 2 (depends on 1) The surface type heating element of claim 1, wherein an adhesive strength of the surface type heating element is about 25 N or more with respect to a substrate or an insulating layer. ### Claim 3 (depends on 1) The surface type heating element of claim 1, wherein an electrical resistivity of the surface type heating element is about 10−4 to about 10−2 Ωcm. ### Claim 4 (depends on 1) The surface type heating element of claim 1, wherein a Ni content of the NiCr alloy ranges from about 60 to about 95 wt % of the surface type heating element. ### Claim 5 (depends on 2) The surface type heating element of claim 2, wherein the substrate is formed of any one of glass, a glass ceramic, Al2O3, AlN, polyimide, polyether ether ketone (PEEK), and a ceramic. ### Claim 6 (depends on 2) The surface type heating element of claim 2, wherein the insulating layer includes any one of boron nitride, aluminum nitride, and silicon nitride. ### Claim 7 (depends on 6) The surface type heating element of claim 6, wherein the insulating layer includes a glass frit as a binder. ### Claim 8 (depends on 7) The surface type heating element of claim 7, wherein the glass frit includes a borosilicate component and/or a bentonite component. ### Claim 9 A method of manufacturing a surface type heating element to generate heat using electricity, the method comprising: providing a substrate; coating the substrate with a surface type heating element layer by applying a surface type heating element paste including a NiCr alloy component and oxygen in an amount of about 1 to about 3 wt % onto the substrate; drying the applied surface type heating element layer; and photonically sintering the dried surface type heating element layer. ### Claim 10 (depends on 9) The method of claim 9, further comprising, before the coating the substrate with the surface type heating element layer, forming an insulating layer on the substrate. ### Claim 11 (depends on 9) The method of claim 9, wherein the substrate is formed of any one of glass, a glass ceramic, Al2O3, AlN, polyimide, polyether ether ketone (PEEK), and a ceramic. ### Claim 12 (depends on 10) The method of claim 10, wherein the insulating layer includes any one of boron nitride, aluminum nitride, and silicon nitride. ### Claim 13 (depends on 10) The method of claim 10, wherein the insulating layer includes a glass frit as a binder. ### Claim 14 (depends on 13) The method of claim 13, wherein the glass frit includes at least one of a borosilicate component and a bentonite component. ### Claim 15 (depends on 9) The method of claim 9, wherein the surface type heating element paste includes: a vehicle including an organic binder at about 20 to about 40 wt % of the surface type heating element paste; a solvent; and a NiCr alloy powder as the remainder of the surface type heating element paste. ### Claim 16 (depends on 15) The method of claim 15, wherein a Ni content of the NiCr alloy powder ranges from about 60 to about 95 wt % of the NiCr alloy powder, wherein the NiCr alloy powder has an average particle size of about 10 nm to about 10 μm, wherein the organic binder is ethyl cellulose, and wherein the solvent is butyl carbitol acetate. ### Claim 17 (depends on 9) The method of claim 9, wherein a total light irradiation intensity in the photonic sintering ranges from about 40 to about 70 J/cm2. ### Claim 18 (depends on 9) The method of claim 9, wherein the surface type heating element after the photonic sintering has an electrical resistivity of about 10−4 to about 10−2 Ωcm. ### Claim 19 (depends on 9) The method of claim 9, wherein an adhesive strength between the substrate and the surface type heating element after the photonic sintering is about 25 N or more. ### Claim 20 (depends on 10) The method of claim 10, wherein an adhesive strength between the insulating layer and the surface type heating element after the photonic sintering is about 25 N or more.